178 STATE BOARD OF AGRICULTURE 



LIST OF WEEDS INTRODUCED IX PACKING MATERIAL FROM I'AINESVILLE, OHIO, 



IN 1900. 



Rugel's Plantain, Plantago Rugclii. 

 Slender Rush, J uncus tenuis. 

 Witch Grass, Panicuni capillare. 

 Barnyard Grass, J', crus-galli. 

 Finger-grass, P. sanguinale. 

 Sheep Sorrel, Jiumex acetoscUa. 

 Pigeon Grass, Setaria viridis. 

 Pigeon Grass, (S*. ylauca. 

 Stink-Grass, Kragrostis major. 

 Stink-(irass, E. Purshii. 

 Bull Thistle, Cnicus lanccolatus. 

 Sow-Thistle, Sonchus oleraceus. 

 Pigweed, Amarantus retroflexus. 

 ^lichaux's Cyperus, Cyperus sijeciosus. 



DISEASES NOTICED ON CULTIVATED PLANTS. 



The following is a list of fungi causing plant diseases which were collected on the 

 station grounds, specimens of which have been placed in the Herbarium: 



Karly blight on potatoes. 



Rusts were plentiful on wheat, oats, rye and barley. 



(The fact that the seed grains were brought from a distance and that no crops 

 of barley, wheat or rye were grown in the immediate neighborhood, tends to 

 strengthen the theory that rust may exist in the seed.) 



Leaf spot on strawberries. 



Rust on corn. 



Shot-hole fungus on plums and cherries. 



Mildew on gooseberries. 



Spot disease of gooseberry. 



Alternaria on turnips. 



Leaf spot on sugar beets. 



".Sun scald" injured some of the young shoots of newly set apples in August, but the 

 trees had recovered by September first. 



The following plants are reported from the Upper Peninsula for the first time, all 

 found in the station woods: 

 Aspidium Goldianum. 

 Aspleniuni augnstifolium. 

 Car ex careyann. 

 Carex sychnocephala. 

 Triostcitm pci'foliatum. 

 A violet was found in fruit, which is probably unnamed. 



THE DWARF MISTLETOE IN MICHIGAN. 



One plant new to the State was found, which deserves notice from the fact that 

 it is a parasite on the black spruce. This plant is the dwarf mistletoe ( Arceuthohium 

 pusillunu Peck). This mistletoe was found August .30 in a tamarack swamp, a fourth 

 of a mile north of the station. The plant is only an inch high, but makes up in 

 numbers what it lacks in size. The male and female plants are usually found on 

 different trees. They stand thickly on the upper sides of the branches. The female 

 plants first appear on two-year-old branches, and the fruiting plants do not perfect their 

 seeds until they are two years old, so they are plentiful on four-year-old branches, and 

 some were seen on even older branches ; in one case the affected branch was twelve 

 years old. The male plants first appear on three-year-old wood. The seeds ripen 

 early in September, being covered with a sticky substance and being expelled with 

 considerable force from the fruits, they stick to the branches, where they germinate 

 and enter the host tree. The effect on the tree is remarkable. When a tree is 

 attacked by this parasite, the branch affected is stimulated to an extra growth, 

 forming dense clusters of spindling branches, which take an upright growth, form- 

 ing large bunches on the trees, which are readily noticed. These clusters have the 



